From the 17th century, following the reforms of Patriarch Nikon, the upper vesture worn by monks of the Great Schema (skhimonakh) is in the form of a pointed hood with two long lappets which cover the back and breast. It is black in color, and embroidered with crosses, six-winged seraphim, and the text of the Trisagion. It is worn above the mandyas (monastic mantle), and is the same for both monks and nuns. In the context of monastic vows, it is called the koukoulion of kindliness, and the helmet of salvation. The koukoulion replaces the klobuk which is worn by the monastics of lower ranks.
The Patriarch of Moscow and all Russia wears a white koukoulion with a "Zion", a stiffened point topped by a cross. He wears this ex officio, whether or not he has been tonsured into the Great Schema. Koukoulia are also worn by the primates of certain other Orthodox churches, for example the Catholicos-Patriarch of All Georgia.
- Philippi, Dieter (2009). Sammlung Philippi - Kopfbedeckungen in Glaube, Religion und Spiritualität,. St. Benno Verlag, Leipzig. ISBN 978-3-7462-2800-6.
See also 
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